How to add additional field to a gridview's data source, generic collection?

Hi, I'm using vs2012
I have a List<UserPrincipal> objects that I set as the data source for my gridview control. I am now asked to add an additional AD user object field that is not part of the class UserPrincipal fields. How to add this additional field to the gridview or do I need to create a new dataset for this?

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